Propeller



V. OLHOVSKY.

PROPELLER.

APPLICATION FILED ram/31, 191s.

- Pat mated July 113 Wfiifh ing drawings forming part hereof, wherein, Figure 1 is a perspective view of a hol low propeller in accordance, with my in-' on the outer sides of the portion shown in 1 UNITED STATES PATENT OFFICE.

VLADIMIR OLHOVSKY, or NEW YORK, n, Y., ASSIGNOR r0 ERNST J. OHNELL, or

I BROOKLYN, NEW YORK.

PROPELLER.

' Specification of Letters Patent.

Application filed May 31, 1918'. Serial No. 237,619.

To all whom it may concern:

Be .it known that I, VLADIMIR OLHovsKY,

county of New York and State of New York, I

have invented certain new and useful Improvements in Propellers, of which the following is a specification.

The object of my invention is to provide a propeller -adapted for all classes of propelled flying machines, such as aeroplanes, seaplanes, dirig ibles, etc., and which shall be relatively light in weight, extremely strong in construction, not affected by temperature, mud or water, cheap to manufacture, and which will withstand considerable piercing or injury by bullets without ren-- dering it ineffective.

In carrying out my invention I make the blades of the propeller hollow of sheet metal, formedto suitable dimensions by bending, hammering or stamping, the longitudinal edges of which blades are rigidly secured are secured to a hub in a rigid manner for application to an engine shaft.

My invention-further comprises novel details of improvements and combinations of parts that forth and then pointed out in the claims.

Referenceis to. be had to the accompanyvention; Fig. 2 is a diagrammatic view of a blank adapted for the blades of the proeller; Figs. 3, 4. and 5 are sectional details of the longitudinal edge portion of one of' the blades, showing different means for securing such edges together; Fig. 5 is a sectional detail View of the inner ends of two blades showing their relation before assemblage; Fig. 6 is a cross section of the inner end of one of the blades before completion; Figs. 7 8 and 9 are'diagrammat'ic cross sections respectively on the lines7, 7, 8, 8, '9, 9, in Fig. 1; Fig. 10 is an enlarged detail edge view of the center portion of the propeller;

Fig. 11 is a section on the line 11, 11, in Fig. 10, before the reinforcing plates are applied Fig. 10; Fig. 12 is a plan view of Fig. 10;

Fig. 13 is a cross section through Fig. 11;

and Fig. llis an edge view of the hub portion of two blades welded together.

together, and the inner edges of which blades I will be more fully hereinafter set The blades 1 and 2 of the propeller are substantially alike and extend from opposite sides of the central rigid portion 3, having suitable shape for action in the air. Each blade is substantially like the other and a description of one will suffice for both. The blade may be made from a piece of suitable sheet metal, which may be cut in a manner shown by the blank 4; illustrated in Fig. 2, the outer edges 45 of which may be rounded Patented Jul 13,1920;

and the inner edges 4;" of which may be recessed. The blank is folded in a longitudinal direction along the mid-center indi-' cated by the dotted line 5 in Fig. 2, and the two free longitudinal edges of the blank are secured together at 45, providing a hollow blade. This maybe done by lapping the edges one upon another, as indicated in Figs. 3, 7, 8, and 9, and securing said edges together' by welding or brazing in any suitable manner, such as by the'oXy-acetylene process. Or, said edges may be folded as indicated at' 4 and riveted together at 6, as shown in Fig. 4, or said edges may be rolled together as indicated at P in Fig- 5 and riveted together at 6. The securing together of the longitudinal edges of the blade will preferably be accomplished after the blank has been out, folded and bent'tothe desired shape, which latter may be done byhammering the metal sheet upon a form or by stamping it. The inner ends of two opposing, blades are to be rigidly secured together,

'for which purpose plates 7 may be inter- While the blades will have any desired shape at different places in cross section, Figs. 7, 8 and 9 indicate shapes of the blade at different places. In Fig. 5 the opposing'ends of the blades 1, 2, after they have been folded and their edges secured together, are shown in position to receive between them the plates 7 prior to welding said parts together. In assembling the parts 1, 2, 7, one of the plates? may first be welded to the adjacent ends of the two blades, then the block 8 may beinserted, and the other plate 7 may be weldedto the meeting edges of the blades uniting the latter firmly together rigid structure.

with the block interposed. The hub portion of the propeller, when the blades have been secured to plates 7, may be reinforced by means of reinforcing or bracing members 9, which-extend over said plates and along the sides of the blades, and also extend a suitable distance preferably along the leading edges of the blades. Said bracing members 9 may be applied upon opposite sides of the propeller and may be secured to the blades and plates 7 by welding or by the oxy-acetylene process to unite the metal parts in a unitary Over the reinforcing members 9 plates 10 may be placed and said parts may be secured together by bolts or rivets 11, substantially as illustrated inFig. 12. The

- propeller described may be secured upon an vengine shaft by means of a hole through block or hub 8 and plates 7, 9 and 10.

The leading or air-cutting edges and the corresponding rear edges of the blades are illustrated as extending in straight or rectilinear lines from the inner or hub portion .of the propeller to the tips thereof, whereby the metal of the blades may be bent and shaped as required. Such an arrangement permits ready shapingof the blades from the blanks and facilitates the assembling and welding together of the edges of the sheet metal, reducing the cost of'manufacture and giving strength to the blades. It also will be noted that the hub portion of the propeller'is polygonal in cross section the hub.

and that the leading and rear edges of the blades extend in straight lines therefrom (F igs.v.l0 to14), whereby the sheet metal may be readily shaped affording required strength of the propeller at and adjacent to A propeller constructed in accordance with my invention will be relatively light in weight because it is hollow, and will be I exceedingly stiff and rigid, capable of use in flying machines, such as aeroplanes, seaplanes and the like, and Will not be affected by water or mud. The parts of the propeller will not be liable to separate in use, and can .be manufactured in quantities at relatively low cost, giving great advantages over propellers for flying machines made of wood, since numerous. bullet holes in the propeller will not destroy it or affect its rigidity or operativeness.

Having now described my invention what I claim is:

1. A propeller comprising hollow blades having corresponding edges secured together, plates secured tothe inner edges of such blades, and reinforcing members secured upon adjacent ends of said blades and to said plates.

2.\ A propeller comprising hollow blades having corresponding edges secured together, a hub secured midy ay within the propeller, and reinforcing members secured upon adjacent ends of said blades.

upon the leading edges of the blades.

'4. A propeller comprising hollow metal blades, having reinforcing members secured to'the sides of the hub portion and extending along the leading edges of the blades. Signed at New York city, in the county of New York and State of New York, this 23rd day of May, A. D. 1918. v

VLADIMIR OLHOVSKY. 1 

